How to Write a Complaint Letter [Video]By andre bradley / December 28, 2020 / Complaint Letters Learn the format, vocabulary and grammar for writing a complaint letter. Learn exactly what to write in each paragraph and how to remain polite and formal to get your reader’s attention. Related Posts Writing a Complaint Letter Against a Coworker [with Sample] How to Ask for a Refund in a Complaint Letter [with Sample] Writing a Complaint Letter to Landlord about Neighbor [with Sample]